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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d367bd6e2bdfa26cf67021f67ccb7003dbab70b687b93ef663300c4c2e2d47' 
  AND token = 'A+Bkbu6y/Mb1hOF0hBPfKoGbNbmm5YYl/4oGfsv2E7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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