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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19c62b4e455b59a47ce1cf31a7f2876d42daca25cbd496378e707854a2c3c7c' 
  AND token = 'XKP8mJ8JhbUBHqzdy0Xxoo4JMmsxUsP3ICTr79N1lAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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