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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c9b70cfb0818d821261f89f9d72c5d3af45994ea19845f76d327c8c1eb76a7' 
  AND token = '26xDj0CzeUy276JApR0CGnHXpUIFs7UO/YO8e5HRb6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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