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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43102d8f8cdb9772611068cee073eac2ae1a1f40f9e7f353a37a147bd7050679' 
  AND token = '064M1A29rwbi5wKI1a4d0li3CF2yIXxdiyaWrRjVyAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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