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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2dcd0f7946bdec452487c402a686fc991f1d814984aa608a8f6123e9922e8a8' 
  AND token = 'u956PtHxzff1Tlz4vlc8U1sXr/mGbsemM6rbNiWs94U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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