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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d41b5824a0ace9e347e0af8eebf915bc80f8a63c9a4a61c77313f7c6b62a83' 
  AND token = '3nbPwjtU9hZ7PF9C5HQtW84TF/w1tB/llGQO6ByLsmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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