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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699cb4d5737fa9241c11b7c5a41ac7541f1ff3c4fa4510810135caa8a72ebf02' 
  AND token = 'gmCVHebpJ1rX6kLJh5xk72ycSw2j2ZgxDzpa9IjuifM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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