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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef8d1bb0ed592b4ab524c390097b6f877bc336ed3ec4c6f9b2f41f92887a710' 
  AND token = 'gbf92i0AV1MZh4s4R1QUMgNcvFe7OD0UJZTHQqa3fhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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