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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eaf01f2133870a638f703db0ff3d84f86b32e5922d9be9243c8abc4ccc30ac1' 
  AND token = '2S8yQ11w7F2Sy93e9v01yPxFnEvPjv/7tQO4870D/YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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