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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58c723cfea78b94e5bc6f707b10b9f25c493180cdeadc895d37c0a2d46a8d07' 
  AND token = 'oYGwo9NCQpTovan5Xmb1QdagpB5a0Io26l611iH6/kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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