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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42dd5b3c07a24526e9f668469245e33f1b93ef6dc4584e274650e6ffecd38dfd' 
  AND token = 'zvOlU+3f3RZfAaQ3BJZo6zE+eMiC61pUs4pSuYEtIME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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