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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd636cff37f23c386480bafcf5b88aec10dea350b71a595964a6b30289bbdfc' 
  AND token = 'dXlNk/BzaF/cIlh9N6SINe29g//xc9nqH19u+Wfzz2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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