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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd38457a106d5255dd1e766157fda97c637098d75ec91c9daa8e69c5cbef364d' 
  AND token = 'EeDQ3eydST+9yE4oJP9H+DRniHx73avV4+bVaapQMwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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