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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '226e74172614116185c8d71a26360d0aa7beb211a1d2c38955570b1c90fdc411' 
  AND token = '7t+vmOPysNkcLLiegi/mr+RSIHUv3GI0+iINxBFzDKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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