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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7008fb0ce3cd4e655cff92e79b858802b0ffb3652b543dae420f63589d70174d' 
  AND token = 'wtCDBnxVAast87pCB4HJ4XdwiXE3M69rwgs6XB3zAfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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