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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d98467bb698c2e28fa513dd6b4b4e25de8f9570a73b5872ad750dca5efbdbc7' 
  AND token = 'zkHq63Zb1RQEz8dWHHpRdm1K5FSaEdp2xoYY9bWj2A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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