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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eec0c31fa6e69f73956458aed0dbb6b2786046fa3a4204a9c8a667ff6c9ace8' 
  AND token = '31DZZ42OQK69wKGSAoYDH97D4Za+oODLbRgTxwDcKco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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