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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4b151bae2c5a3d2aafeee16f96a39e4fb3f7ff3ed87eb12621d4823c73ce97' 
  AND token = 'Qux3z4RFmA01aODkArJMHCsHpm+GUdoEsAjvbiax7f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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