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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '258231c311f60c428670bb35cba0d461d8292beea0604e5f8986bc20dc001a79' 
  AND token = 'r8J6UVupwxUdU/b7DkHFQISEqyz1o0yYD4TOqq5eqPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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