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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52260276d0d0d1e9c191ca0e1ce6a6d0c1d7a6ae19fb215b3a78538b70c8ace' 
  AND token = 'dw+HKZHqqbrNsNlwfgMwUEOl0YHmr5ZxsznxkzffNAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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