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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40aa73bc45fec85acd65ba0f22be6325b1c025996014f0a8ffc34360710a271b' 
  AND token = 'qLDdBqFM1ho96SoVO8KHmivd49piF9pjnyi43vkHRxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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