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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa94e370b4fc2c4dd3ad16e1ea4958a63fbbf82974fb208e20ebfd3e04e3e05c' 
  AND token = 'qMo9XkD91LnzwApg93klPi6GURsw1RzCoi3PnQYxjKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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