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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca326c55b0b35763c115aca18bf5bc5793a153410514f6d0a896d6450910fc0' 
  AND token = 'L4hy1gsL0V65+rsPa9CWqtPrLvrepAnw1E8iZlFKGk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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