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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08ede7c6aea7a4ffae022d517aac845bf963611352d067464fbd331d1a22906' 
  AND token = 'Z75sSO5vCn9mkE/LCZkp/wiEBbj3hSj2Dcjx6TWfe/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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