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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed193b4d279f2d4ca87b31c6e21a4b439fdde521267bc1214ae36a7d1a11186' 
  AND token = 'dT8aCbNB526gLZizX/U4B7zswXt2e+8dpqZPbElGReI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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