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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef8756b08580660862033970226173fd6ef231123f15c20fed497f0d86ff4e9' 
  AND token = 'j6WVw4R1abOWJFldB7BY72zOdbooU2YnB5XlxI/AMGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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