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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a887d7870e6d5d5f2e6adbf110c10778e33e6dd0a1f9c3e373d8aa22167199cc' 
  AND token = 'e+wNaerh1cVffAYGW4p87V3YqarcQUDLvKwEv61t668=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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