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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347b67f92f947ec74fc89dfd19c71e01228c4e83f32f5ba8920d5c619125c36c' 
  AND token = 'rfFWaYeB5qV5lqQ6iebRVnYH3wl9P8iAQNQvFlB3mTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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