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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1b6954dc0f7ef43099dfde9f9413bd4d5b12ef6c1d8c23bae0c51fd32d2462' 
  AND token = 'MTHQn2sFcraQ7DAyv1dwAgtmoPuIDihDnyATQAL4CBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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