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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca823eea725f70b2ae3396b33efc5bc8fa1f2960e201bac00bc5c75f0a77ae2' 
  AND token = '4hHfgIEES/isqMugt2gZRYlrlUSuxitCUivYyz/NNHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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