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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e54a2a754fae07b3a3922d1ce85694b5c7fa944823105e2cd30e92e384e21f' 
  AND token = 'fTYtFllea+xes0JPXJYL/tj8TLPaZdf19EgD6MuM6V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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