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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94618a7a6e25cff44cef4ea7bf575151603d6dcda155fb9eaced5fd8671fa44' 
  AND token = 'ImR+KswaEHajfUael3YLOSFBnZftGD7Z5ILAWY96nnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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