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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7fd38fb2175a971ce538b2897c64a916c73621461ca1ca7b96a0e1e4a3ce92' 
  AND token = '2K81n5jPJGrNRcP31QjKsa/gLXZMW1PQVpy/+ZFLmc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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