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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4766e7b42155ad1c46ef108ae3c3f5d5a75d694c8caac478268a78b52cd045f' 
  AND token = '5JVr/drNc4RtwvIJ96tCQ0nlu2HBjQnsCzyOIEtMZUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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