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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71df90f349a3cb4c5f7bd42bb9a194652a1e5d5c8aee5a822415365927b9c4a9' 
  AND token = '3xh+a2W+RtwZQZ2Efh8r0PmrLxyRxDbc5s0LpYmcjkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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