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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ffd678b21b4f8eec6e89723398668342f0465532d4312cafad5237ac418eb6' 
  AND token = 'tmkwuH8oY7a8sjVAky1c+yHfz+1gUYMcopFUgiUi8Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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