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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21b25a9bc2a82ef25dc5b4468cdc54ae34c0e8f15d9598b80eb2b115c1ceac59' 
  AND token = 'eV/g5nCxZwRm31HK4Aaj2iN4ihCjXwictll/F4pAXIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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