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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2bec85f4da1b1a6c5ef51af08f982fac92f12f5331efa512019f1afda25868' 
  AND token = 'QvT80AFsBp/SjSfMcrFRTbr1z2/+mCd85VLq9hVyR9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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