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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02f9b919641c1293839e322509e0009337a49ef0bddee6f8b1c1ed97f1e39de' 
  AND token = '8uqDkVxrztVIKzZWcVbEf9qu1TQ1ktiQhpZeS7J2NsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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