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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4628e693426b46d8fca6164d1214233b45c519495a9eb6e9fae8e14d901b8156' 
  AND token = 'UaiDH0VVdX0z6pXeaE5pmga554dEj2fX/Kh6CPkO9ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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