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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce73428d4b3eb150f431f02b5a84f14af9cd6abb19311c18764db33e853c95a' 
  AND token = 'B71mSBy2VZY4iX8spGYRi/a1kz4R6JPvkZe0yf+eY38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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