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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff7a22a43ed00a13c191f21176aabdc48b1c53667b17f6add83e2964a851bf0' 
  AND token = '9G4TxGj7uk0VoNCcZ8747i/LRd5aHeR73HnKFtmDGao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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