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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15495083129d89d84fe7a7b079a5d10ad5b615e96e19b924ce1575dbdd890fbe' 
  AND token = 't0I3d8EBMhzEcREKiTQwrWAROlB8A5tAiPT6X/Euzqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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