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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b970512db1e703f22365e1067f0a9cb46bd8770af24f45ce4e8d17d035032f' 
  AND token = 'hkqucJwhif0CEELl0szgio1EmAExxKV9yFlUjivfwiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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