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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0832c11eb9c50098f806bc0b41a1928bf3fdfd47dbb7c49bb3e0e914fb2eee5f' 
  AND token = 'Yvx2DHER52K+GOvIJaSrJj8+3BEbLVESag5JD2MIt4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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