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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877dfaa618b4a1f535549e9c218573ad6a312965cee34f4345cd4aae786acb9d' 
  AND token = 'avqnXapL3oQrNAA2ThEa9pa8diDGvYZge401xfdg0Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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