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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e8a0c95b6a05f6330b9f7ea53ce73b3875b887a846f299d13c1e2a12a0524d' 
  AND token = '/ZU20AE4oWoqrcicNLiTTxTQMwkNwPwiO/qqvPrHfiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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