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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9799863e4dd792d9d5d8d5db69f0b92ef2b99accf95b1e8fdea83ef284fe36e7' 
  AND token = 'iGdPBUqUp8l9qIVDjMgeY3rGrRNRrLT9BkS4llI143I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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