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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b9b257d12321279d840d8839c9dbb448a2d862fe8e1f770476ea7f69f22281' 
  AND token = 'cBs89KEGTh3f03eoABB/MHcnLe2XkyRwqSnl8xUIqzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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