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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733cf89c12f4ab22bdc5232ac95f1d20fcd665edcbea75dace2e8e71015062ad' 
  AND token = 'PpetjpZYS6eBf5fQu0Dvt3Ys4+MXb4rYqe/bnUcdpIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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