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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96cf2f02ac9f5f2e4a90b610116c945166020e8af54df4fe8d8b057a70668c8f' 
  AND token = '4fwLFgl94pJ5lvN9MhJeJKgjJD5xvtArvr1uhNj/tOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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