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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e4382693f6f2173d921c42711dfc4f51cb3cc99e0144c6293c3cd56f3c4324' 
  AND token = 'OC8QETAdrxoCvsu8dLhZ6bWjhSouqR2+EbxVchWBEfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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