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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205f6aeeb4168134cc49b9d695a52b38536ec332f01d0b36b80a45278117bb9b' 
  AND token = 'V51fgy4VZPRvjhA8mPorzHfawxQCFSerJdyT5hy3D/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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