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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3567979e0acdd6291ae5d4059e266f20bd5bcb5a0bbd11a7086e64503e95406e' 
  AND token = 'pQ2rspCa8i23HMjTYIuOWIpmJU/xYUv3nH8upS5G8jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}