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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fd26aa3ce26f866e06cdb736394adfdd1ed0a06a13ec931e1d7b83fb97e91b' 
  AND token = 'uReQwwItVjGtu42NYLXb3GOMdJNCq63oSRDYuvs8shU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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