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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4692026e86297c1536a1d3cc01266aca15565a86e46bd326623c7c8e200a583' 
  AND token = 'hEF4g9qbbqMdYgI7RfAx/XM9GqJRJv68+GU7HKjr0v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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