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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37756badf85b5e5e4b9dd0bb6131722d8e6b8d2bb8a58a3b80f9fc994e7fee40' 
  AND token = 'nnmeiR0XRrcp/tr/xZE/33C4niqhTS0AI+rKT3agvgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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