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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9dedeb13013f551b43dd00d7c2db0456a5616b9eb04c81e0f1ba26b40de490' 
  AND token = 'm6AlE7gOwXrRix8U+RrRFvo9Yi2sNIfqpYMfWmYhG+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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